<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="allIn" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <!-- <ShopCar v-model="goodList"></ShopCar> -->
      <tbody>
        <tr v-for="(item, index) in goodList" :key="index">
          <td>
            <input type="checkbox" v-model="item.checked" />
          </td>
          <td>{{ item.name }}</td>
          <td>{{ item.price }}</td>
          <td>
            <button @click="item.num > 0 ? item.num-- : 0">-</button>
            {{ item.num }}
            <button @click="item.num++">+</button>
          </td>
          <td>{{ item.price * item.num }}</td>
          <td><button @click="remove(index)">删除</button></td>
        </tr>
      </tbody>

      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allMoney }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
// import ShopCar from "./components/ShopCar.vue";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    remove(id) {
      this.goodList = this.goodList.filter((item, index) => index !== id);
    },
  },
  computed: {
    allMoney() {
      if (this.goodList.some((item) => item.checked)) {
        const list = this.goodList.filter((item) => item.checked === true);
        return list.reduce((dev, item) => dev + item.price * item.num, 0);
      } else {
        return 0;
      }
    },
    allIn: {
      get() {
        if (
          this.goodList.filter((item) => item.checked).length ===
          this.goodList.length
        ) {
          return true;
        } else {
          return false;
        }
      },
      set(value) {
        this.goodList.forEach((item) => (item.checked = value));
      },
    },
  },
};
</script>

<style></style>
